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Test Info:

<!DOCTYPE html>
<!-- saved from url=(0065)https://bug1134545.bugzilla.mozilla.org/attachment.cgi?id=8566418 -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<script>
function boom()
{
textNode = document.createTextNode(" ");
x.appendChild(textNode);
x.setAttribute('contenteditable', "true");
textNode.remove();
window.getSelection().selectAllChildren(textNode);
document.execCommand("increasefontsize", false, null);
}
</script>
</head>
<body onload="boom();">
<div id="x" contenteditable="true"></div>
</body></html>